Equipment and method for realizing dual-energy scanning by using flying focal spot switching and X-ray filter

Abstract

The invention provides equipment and a method for realizing dual-energy scanning by using flying focal spot switching and an X-ray filter, and relates to the technical field of medical images. The equipment comprises an X-ray bulb tube and an X-ray filter; the X-ray bulb tube can emit two X-ray beams from two different X-ray focal points; the X-ray filter is arranged between a CT detector array and the X-ray focal points and is provided with slits which are distributed periodically. According to the X-ray beam emitted by one of the X-ray focal points, X-rays of odd-numbered channels directly pass through the filter without attenuation, and X-rays of even-numbered channels are attenuated through a filter material, and the X-ray energy spectrum is changed. According to the X-ray beam emittedby the other X-ray focal point, X-rays of even-numbered channels directly pass through the filter without attenuation, and X-rays of odd-numbered channels are attenuated through the filter material,and the X-ray energy spectrum is changed. Therefore, the purpose of dual-energy CT scanning can be achieved. The scanning mode can combine a flying focal spot mode and an energy spectrum CT scanning mode when a heart is rapidly scanned, and requirements on the bandwidth of a slip ring is not high.

Description

technical field [0001] The invention relates to the technical field of medical imaging, in particular to a device and method for dual-energy scanning realized by femto-focus switching and X-ray filters. Background technique [0002] The main components of the third-generation CT system include Tube (ball tube), Collimator (beam limiter), and Detector (detector). The X-ray tube emits X-rays, which are limited by a beam limiter to form a cone-shaped beam. The cone-shaped light beam is irradiated on the detector and converted into an electrical signal by the detector, and then converted into digital information by the data acquisition and conversion unit and stored in the image processing system. The image processing system generates images and displays them on the monitor through a series of correction algorithms and image reconstruction algorithms. In terms of cost and technology maturity, the mainstream detectors use a number of detector modules arranged on an arc or polyg...

AI Technical Summary

Problems solved by technology

This is beyond the reach of the current slip ring design. Even with 16-bit encoding, 256 rows of detectors, and a sampling rate of 2048 per circle, a slip ring bandwidth of 28.1Gbps is required. It is almost difficult to achieve high and low KV in cardiac scanning. Combination of scanning mode and flying focus scanning mode

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